Keeps 4 days refrigerated and freezes 3 months. Freeze fully cooked and reheat covered at 350°F for 30 minutes. They also assemble a day ahead — refrigerate unbaked and add 10 minutes.
Not with this method — 35 minutes covered is enough. If you like them very soft, boil the halves for 3 minutes first.
Peppers release water as they cook. Baking cut-side up and draining the beef properly both help; some cooks salt the halves and drain them 15 minutes first.
Yes — increase the meat and add finely chopped mushrooms or cauliflower to keep the volume. The filling will be denser.